P-block elements practice · Medium

S-I: Solubility of noble gases in water decreases with increasing size of the noble gas.

S-II: Solubility of noble gases in water is due to dipole induced dipole interaction.

A white precipitate was formed when $\mathrm{BaCl}_2$ was added to water extract of an inorganic salt. Further, a gas ' $\mathrm{X}$ ' with characteristic odour was released when the formed white precipitate was dissolved in dilute $\mathrm{HCl}$. The anion present in the inorganic salt is

Assertion (A) : Both $\mathrm{H}_3 \mathrm{PO}_3$ and $\mathrm{H}_3 \mathrm{PO}_4$ have the same number of hydrogen atoms but $\mathrm{H}_3 \mathrm{PO}_4$ is a tribasic acid and $\mathrm{H}_3 \mathrm{PO}_3$ is a dibasic acid.

Reason (R) : 1 mole of $\mathrm{H}_3 \mathrm{PO}_3$ is neutralised by 2 moles of $\mathrm{NaOH}$ while 1 mole of $\mathrm{H}_3 \mathrm{PO}_4$ is neutralised by 3 moles of $\mathrm{NaOH}$.

Which of the following is mixed anhydride?

Which of the following is/are CORRECT from the given below?

(I) Brown ring test for nitrate depends on the ability of ${Fe}^{2+}$ to reduce nitrate to nitric oxide
(II) Red phosphorus is much less reactive than white phosphorus

(III) Red phosphorus readily catches fire in air to give white fumes

(IV) White phosphorus is a translucent white waxy solid

$\mathrm{NH}_3$ reacts with $\mathrm{HCl}$. The correct reasons are

I. $\mathrm{NH}_3$ can donate a pair of electrons.

II. The $\mathrm{Cl}^{-}$ ion formed has a stable configuration.

III. The $\mathrm{N}$-atom of $\mathrm{NH}_3$ gains electrons.

IV. A proton in $\mathrm{HCl}$ can accept an electron pair from $\mathrm{NH}_3$.

The correct option is

A gas that cannot be collected over water is

When copper reacts with dilute nitric acid the gaseous product obtained is

What will be the ${A}$ and ${B}$ in the following equations.

$\begin{gathered} 8{{N}}{{{H}}_3} + \mathop {3{{C}}{{{l}}_2}}\limits_{(A)} \to 6{{N}}{{\text{H}}_4}{{Cl}} + {{{N}}_2} \quad \\ {{N}}{{{H}}_3} + \mathop {3{{C}}{{{l}}_2}}\limits_{(B)} \to {{NC}}{{{l}}_3} + 3{{HCl}} \quad \\ \end{gathered}$

What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr?

Among the compounds given in the options, identify the one which does not gives a precipitate with excess of both $\mathrm{NaOH}$ solution and $\mathrm{NH}_3$ solution?

Which of the following is not correct?

Assertion (A): Phosphoric acid has no reducing properties.

Reason (R): Phosphoric acid does not contain ${P}-{H}$ bonds.

Observe the following statements
I. Bleaching powder is used in the preparation of chloroform.
II. Bleaching powder decomposes in the presence of $\mathrm{CoC}{\mathrm{l}_\mathrm{2}}$ to liberate ${\mathrm{O}_2}$
III. Aqueous $\mathrm{KH}{\mathrm{F}_\mathrm{2}}$ is used in the preparation of fluorine.

Assertion (A): When ${H}_2 {S}({g})$ is passed into aqueous ${ZnCl}_2$, solution, ${ZnS}$ is precipitated.

Reason (R) : ${ZnS}$ is insoluble in dil. ${HCl}$.

Which of the silver salts are soluble in water?

Which of the following is used to provide smoke screens :

Assertion : Dinegative anion of oxygen $\left({O}^{2-}\right)$ is quite common but dinegative anion of sulphur $\left({S}^{2-}\right)$ is less common.

Reason : Covalency of oxygen is two.

The gaseous decomposition of ozone $2 \mathrm{O}_3 \rightarrow 3 \mathrm{O}_2$ follows the mechanism

$\mathrm{O}_3 \stackrel{\mathrm{k}_{\mathrm{eq}}}{\rightleftharpoons} \mathrm{O}_2+\mathrm{O} \text { (Fast), } \mathrm{O}+\mathrm{O}_3 \xrightarrow{\mathrm{k}_1} 2 \mathrm{O}_2 \text { (Slow) }$

Determine the order of reaction with respect to $\mathrm{O}_2$ :

A mixture of which pair of species react with water to produce a pure colourless gas that gives white fumes with $HCl$?

Assertion (A) : ${Cl}_2$ or ${Br}_2$ changes ${KI}$ into ${I}_2$ (violet in ${CCl}_4$ layer), ${Cl}_2$ changes ${KBr}$ into ${Br}_2$ (orange-yellow in ${CCl}_4$ layer). Thus, ${Cl}_2$ would change mixture of ${KI}$ and ${KBr}$ into violet layer in ${CCl}_4$.

Reason (R) : Oxidising power is in order ${I}_2 < {Br}_2 < {Cl}_2 < {F}_2$.

Assertion (A): Conc. Sulphuric acid can be used to prepare $HCl$ on reaction with $NaCl.$

Reason (R): Conc. $\mathrm{H}_2 \mathrm{SO}_4$ is a moderately strong reducing agent.

Which of the following pairs is obtained on heating ammonium dichromate?

On reaction with water,

I. fluorine oxidises water to oxygen.

II. chlorine and bromine react with water to form corresponding hydrohalic and hypohalous acids.

III. reaction of iodine with water is spontaneous.

Which of the above mentioned statements is/are correct?

Read the following statements regarding chemical reactivity of group 15 elements.

(i) Only compound of ${Bi}$ with +5 oxidation state is ${BiF}_5$.

(ii) Intermediate oxidation states for both nitrogen and phosphorus disproportionate in both acid and alkali.

(iii) Nitrogen due to absence of d-orbitals in its valence shell cannot form ${d} \pi$-p $\pi$ bond as the heavier elements thus ${R}_3 {P}={O}$ exists but ${R}_3 {~N}={O}$ does not exists.

(iv) ${BiH}_3$ is the strongest reducing agent amongst the hydrides of nitrogen family.

(v) ${P}_2 {O}_3$ is more acidic than ${P}_2 {O}_5$.

Which of the following is the correct code for the statements above?

$N{H_3}\;$ gas is dried over:

The reaction in the Kipp’s apparatus stops on closing the outlet, because:

Statement-I: ${P}_2 {O}_3$ is more basic than ${N}_2 {O}_3$

Statement-II: Metallic nature of the central atom increases down the group

The gas which is absorbed by ferrous sulphate solution giving blackish brown colour is:

Which of the following does not exist?